package com.sky.service.impl;

import com.sky.constant.MessageConstant;
import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.exception.ReportExportFailException;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.ReportMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private ReportMapper reportMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private WorkspaceService workspaceService;

    @Override
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        // 1. 要把开始日期到结束日期的每一天的日期值计算出来
        List<LocalDate> dateList = new ArrayList<>();
        while (!begin.isEqual(end)) {
            dateList.add(begin);
            // begin要加一天
            begin = begin.plusDays(1);
        }
        dateList.add(end);

        // 2. 根据每一天的日期计算当天的营业额
        List<Double> turnoverList = new ArrayList<>();
        dateList.forEach(date -> {
            Double turnover = reportMapper.sumByCondition(Orders.COMPLETED, LocalDateTime.of(date, LocalTime.MIN),
                    LocalDateTime.of(date, LocalTime.MAX));
            turnoverList.add(turnover == null ? 0 : turnover);
        });

        // 3. 把数据按照需求的格式拼接为字符串
        String dateListStr = StringUtils.join(dateList, ",");
        String turnoverListStr = StringUtils.join(turnoverList, ",");

        TurnoverReportVO vo = TurnoverReportVO.builder()
                .dateList(dateListStr)
                .turnoverList(turnoverListStr)
                .build();
        return vo;
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        List<Integer> newUserList = new ArrayList<>(); // 新增用户数
        List<Integer> totalUserList = new ArrayList<>(); // 总用户数

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // 新增用户数量 select count(id) from user where create_time > ? and create_time < ?
            Integer newUser = getUserCount(beginTime, endTime);
            // 总用户数量 select count(id) from user where  create_time < ?
            Integer totalUser = getUserCount(null, endTime);

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * 根据时间区间统计用户数量
     *
     * @param beginTime
     * @param endTime
     * @return
     */
    public Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
        Map map = new HashMap();
        map.put("begin", beginTime);
        map.put("end", endTime);
        return userMapper.countByMap(map);
    }

    /**
     * 根据时间区间统计订单数量
     *
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        // 每天订单总数集合
        List<Integer> orderCountList = new ArrayList<>();
        // 每天有效订单数集合
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // 查询每天的总订单数 select count(id) from orders where order_time > ? and order_time < ?
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            // 查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = ?
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        // 时间区间内的总订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        // 时间区间内的总有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        // 订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();

    }

    /**
     * 根据时间区间统计指定状态的订单数量
     *
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map map = new HashMap();
        map.put("status", status);
        map.put("begin", beginTime);
        map.put("end", endTime);
        return orderMapper.countByMap(map);
    }

    /**
     * 查询指定时间区间内的销量排名top10
     *
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()), ",");
        String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()), ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    @Override
    public void export(HttpServletResponse response) {
        try {
            // 查询近30天的运营数据（概览）
            LocalDate begin = LocalDate.now().minusDays(30);
            LocalDate end = LocalDate.now().minusDays(1);// 计算到当天的最大时间
            // 概览数据
            BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin, LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
            // 把模板文件读入内存中---工作簿对象
            // 通过类加载器到类路径中读取文件(指定相对于类路径的相对路径)
            InputStream is = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
            // 通过输入流读取指定的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(is);
            // 获取0索引位置的sheet页
            XSSFSheet sheet = excel.getSheetAt(0);
            XSSFRow row = sheet.getRow(1);
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
            // 设置日期格子中的数据
            row.getCell(1).setCellValue(formatter.format(begin) + "至" + formatter.format(end));
            // 设置头部概览数据中的各个格子的数据
            XSSFRow row_3 = sheet.getRow(3);
            row_3.getCell(2).setCellValue(businessData.getTurnover());
            row_3.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row_3.getCell(6).setCellValue(businessData.getNewUsers());
            XSSFRow row_4 = sheet.getRow(4);
            row_4.getCell(2).setCellValue(businessData.getValidOrderCount());
            row_4.getCell(4).setCellValue(businessData.getUnitPrice());

            // 生成下半部分的30天明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                // 准备明细数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            // 文件下载：两个头一个流
            // 指定文件格式为excel

            // 动态获取文件mime类型
            /*Optional<MediaType> mediaType = MediaTypeFactory.getMediaType("xxxx.xlsx");
            if(mediaType.isPresent()){
                String mimeType = mediaType.get().toString();
            }*/


            response.setHeader("Content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            // RFC中定义的规范：如果头中携带特殊字符，需要进行转码。使用    *=utf-8''URL编码后的字符   形式指定值
            String encodeFilename = URLEncoder.encode("运营导出数据.xlsx", "UTF-8");
            response.setHeader("Content-Disposition", "attachment;filename*=utf-8''" + encodeFilename);


            ServletOutputStream out = response.getOutputStream();
            // 通过响应的流把文件写到浏览器上
            excel.write(out);

            out.flush();
            is.close();
            out.close();
        } catch (IOException e) {
            throw new ReportExportFailException(MessageConstant.EXPORT_FAIL);
        }

    }
}
